Dear Takuya
Thanks a lot for your instructions.
I can successfully see the start point of arc_length.
* Make the intersection line visible in the 3D view by clicking the eye-icon
* Open Selection Inspector
* Choose the PlotOnIntersectionCurve object from Current Object
* Click Create Selection
* Choose POINT from Field Type
* Click New Value
* Enter Composite ID of your interst DataSet from the Data Hierarchy list
on the left
* Enter 0 in the Index field
Sincerely yours.
waku2005
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